Display screen or portion thereof with a graphical user interface



The file of this patent contains at least one drawing executed in color. Copies of this patent with color drawings will be provided by the Patent and Trademark Office upon request and payment of the necessary fee.

The sole FIGURE is a front view of a display screen or portion thereof with a graphical user interface showing our new design.

The broken line showing of the display screen or portion thereof forms no part of the claimed design. 

CLAIM The ornamental design for display screen or portion thereof with a graphical user interface, as shown and described. 